$ S(7,3) = 3 \cdot S(6,3) + S(6,2) $
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- $ S(4,3) = 6 $
- $ S(5,3) = 25 $
- $ S(6,3) = 90 $
- We compute $ S(6,2) = 2 \cdot S(5,2) + S(5,1) = 2 \cdot 15 + 1 = 31 $, or known $ S(6,2) = 31 $. Then:
- S(7,3) = 3 \cdot 90 + 31 = 270 + 31 = 301.
- Thus, the number of ways to partition the 7 distinct artifacts into 3 indistinguishable non-empty containers is $ \boxed{301} $.
